KMail
About
KMail - a mail client software, which is a part of the KDE desktop environment.
It supports POP3, IMAP, dIMAP. You can send Mail via SMTP and sendmail. KMail supports OpenPGP. You can encrypt/decrypt and sign your message.
Features
- plain text and secure logins, using SSL and TLS
- HTML Mail
- Convert HTML Mail to Plain text
- Mailing list management
- Integration with spam checkers
- spell-checking
- Importing mail from other mail clients